>>113571109Mar-Vell being kept dead is the only thing that allowed Carol to step out of his shadow, and even that took almost 20 years because she spent most of the 1980s and 1990s in limbo.
Wasp hasn't been connected to Ant-Man or Hank Pym since the 1980s. The MCU's Wasp who shared a movie with Ant-Man is a different character to either of the comic Wasps, but Janet has no history of solo material at all.
Wanda has more history of solo stories or with Vision than with Pietro, they haven't been on the Avengers together that often since the early 1970s. X-fags only see them in terms of supporting cast for Magneto, but she only seems to interact with him a few times per decade, it was never as important as people think, and the MCU has introduced her to millions in a form completely unconnected to X-Men or Magneto.
Like every female X-Men member, they spend most of their existence as part of a team book's ensemble cast, these aren't characters that were created for solo stories, to make them succeed you have to do the work establishing them as a solo character, build them up and build an audience.
Or just refuse to accept defeat, keep publishing and relaunching until you eventually manage a run that sells acceptable numbers, like they did with Carol.